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Question: When a person inhales, air moves down the bronchus (windpipe) at 17 cm/s. The average flow speed of the air doubles through a constriction in the bronchus. Assuming incompressible flow, d
A bathysphere used for deep-sea exploration has a radius of 1.52 m and a mass of 1.23 x 104 kg. In order to dive, this submarine takes on mass in the form of sea water.
Calculate the work done by on the particle as it moves along the purple path (OAC).
The rope and pulley have negligible mass and the pulley is frictionless. The coefficient of kinetic friction between the 8.00 kg block and the table top is uk = 0.250. The block are released from es
A 14.1-g bullet is accelerated from rest to a speed of 793 m/s in a rifle barrel of length 66.9 cm. (a) Find the kinetic energy of the bullet as it bullet as it leaves the barrel.
What is the speed of the object when it reaches the point x=5.00 m? What is the instantaneous power at x=5.00 m?
A 500-kg package slides 1.50 m down a long ramp that is inclined at 24.0 degree below the horizontal. The coeficient of kinetic friction between the package and the ramp is uk+0.310. Calculate a) th
You throw a ball vertically upward so that it leaves the ground with velocity 2.49 m/s (a) What is its velocity when it reaches its maximum altitude?
Water is pumped into a storage tank from a well delivering 21.0 gallons of water in 27.0 seconds through a pipe of 1.00 in.2 cross-sectional area. What is the average velocity of the water in the p
The frequency is either 444 or 436 Hz, and the property is the Doppler Effect, Fundamental Frequency, Harmonics, Speed of Sound in Air. (I think it's Doppler Effect.)
Water is pumped into a storage tank from a well delivering 15.0 gallons of water in 34.0 seconds through a pipe of 1.00 in.2 cross-sectional area. What is the average velocity of the water in the p
An object weighing 335 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Immersed in oil, the object weighs 285 N. (a) Find the density o
A bathysphere used for deep-sea exploration has a radius of 1.50 m and a mass of 1.19 x 104 kg. In order to dive, this submarine takes on mass in the form of sea water.
An empty rubber balloon has a mass of 0.0115 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.400 m. If the filled ball
calculate the following (a) the work done by this force on the particle J (b) the change in the potential energy of the system J (c) the kinetic energy the particle has at x = 4.90 m if its speed is
What is its kinetic energy at this moment? Find the net work done on the object if its velocity changes to (8.00i + 4.00 j) m/s.
Find its spring constant. The load and the spring are taken down. Two people pull in opposite directions on the ends of the spring, each with a force of 185 N. Find the length of the spring in this
Assume you pay $0.10 per kW-hour for electricity. How much would it cost just to keep the hot water inside the heater for one week? The Joules are 6.87 *10^12.
How much energy is lost through the walls of the hot water heater in one week? (Assume thinner surface of the heater is 90 C and the outer surface is 27 C.)
What is the value of the acceleration of gravity at that altitude as a percentage of the acceleration at the surface of the earth?
Calculate the activity of Uranium-238 in 100 grams of uranium ore containing 5 weight percent U308. What is the expected activity of Uranium-234 in the ore?
Question: Calculate the change in the amount of bremsstrahlung that would be produced if an aluminum target were substituted for an iron target. Please show your work. Please show your work.
Question: What percentage of a photon beam would interact in passing through a 3-mm slice of absorber if the linear attenuation coefficient were 0.15/cm? Please show your work.
Question: How many "average" collisions with hydrogen nuclei would a 1 MeV neutron need to undergo before it becomes a "slow" neutron?
Calculate the pCi of K-40 per gram of human body mass. Assume the human body is 0.2% potassium, by weight, the isotopic abundance of K-40 is 0.0117% in natural potassium, and the gram-molecular wei